[Suppression of evoked otoacoustic emissions by contralateral noise exposure in humans].
The effects of contralateral noise exposure on evoked otoacoustic emission (e-OAE) were investigated in 10 normal hearing subjects and 3 cases with unilateral deafness. The e-OAE was recorded by ILO88 and weighting noise was given to the contralateral ear (impaired side in unilateral deafness cases). The air conducted noise exposure showed suppressive effect on e-OAE along with the increase of noise stimulus intensity in normal hearing subjects, but did not in unilateral deafness cases. The degree of suppression in e-OAE was most remarkable in highest peak power between 1 kHz and 2 kHz in FFT picture and the mean value of maximal suppression in 10 normal hearing subjects was 2.2 dB. The bone conducted noise exposure showed no effects on e-OAE in either normal hearing subjects or unilateral deafness cases. It was suggested that the contralateral noise exposure could suppress the function of cochlear micromechanics probably via crossed olivocochlear bundle.
Abe
T
T
Department of Otorhinolaryngology, School of Medicine, Iwate Medical University, Morioka.
Tsuiki
T
T
Ito
S
S
Endo
Y
Y
Suzuki
K
K
O-Uchi
T
T
D000158:Acoustic Impedance Tests; D000161:Acoustic Stimulation; D000328:Adult; D001844:Bone Conduction; D003051:Cochlea / Q000502:physiology*; D005260:Female; D034381:Hearing Loss / Q000503:physiopathology; D006801:Humans; D008297:Male; D009622:Noise